The easiest way to do this in Windows 7 is to use the instructions at the bottom of the DiskCleanup utility where you can wipe out all your Restore points. The reason for doing this is because Malware likes to hide in the Restore points and the minute you use System Restore, your computer is infected again. Once that is done, you can create a new Restore Point by right-clicking My Computer and selecting Properties. Next, select System Protection and select "create a new Restore point" down at the bottom of the pop-up box.